The selecting frequency network usually located in the amplifying circuit, or located in the positive feedback network.

其中的选频网络一般可以设置在放大电路中，也可以设置在正反馈网络中。

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If you want to send a no-hard-feelings signal for the sake of future conference-circuit encounters, put in some vaguely positive statement: you've enjoyed "aspects of the job" or "learned a lot."

如果因为将来还会在会议圈里碰到，而希望传达出你并未心怀怨恨的信号，那就写一些稍微积极一点的话：比如你喜欢“这份工作的一些方面”或是“学到了很多”。(第二种说法很好用，因为它虽然听起来不错，但实际可能指的是任何含义。)

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